Process of making sound-records



R. HEAD.

PROCESS 0F MAKING SOUND RECORDS.

l APPLIQATION FILED JULY 15,1915. 1 ,358,949. Patemd Nov. 16, 1920.

IN VEN TOR.

UNITED STATES PATENT' OFFICE.

ROBERT HEAD, 0F NEW YORK, N.

RATION OF CONNECTICUT.

PROCESS OF MAKING SOUND-RECORDS.

Specification of Letters Patent.

Patented N ov. 16, 1920.

Application filed July 15, 1915. Serial No. 40,108.

To @ZZ whom t my concern.'

Be it known that I, ROBERT HEAD, a citizen of the United States,residing at 206 lllest 85th street, New York, N. Y., have inventedcertain new and useful Improvements in Processes of Making Sound-Iecords, of which the following is a specication.

My present invention relates to improvements in methods of making soundrecords. rilhe features and advantages of my improvements will beapparent to those skilled in the art from an understanding' or" thefollowing description.

The accompanying drawing shows diagrammatir-.ally the different steps ofthe method constituting the subject-matter of the present invention.

I out or trace the original sound-record as a groove in a wax-likematerial which is capable of accurately recording the original sounds.

Starting with the grooved record, in wax',

,I make its reverse by molding it in plaster,

clay or the like. The clay reverse may be dried or even baked or burntlike pottery.

From this plaster or cl reverse, l then mold a type or other suitablemetal copy, usable in a pantograph as a pattern or guide record fromwhich to cut a duplicate record of the same or a different size,preferably smaller to minimize any errors or discrepancies, saidduplicate record being cut (as set iorth by me in my Patent No.1,318,997, granted March 18, 1918) in soft steel, adapted subsequentlyto be hardened, and from which a thin sheet steel copy is adapted to bepressed, hardened and backed up to form a matrix by which the commercialrecords can be pressed.

Or I take the aforesaid plaster or clay reverse, and mold v a plaster orclay copy from 1t. Then using this as a mold, I make a steel or othersuitable metal casting which I then treat in the usual or well known wayfor use as a matrix by which to press the commercial records.

0r I take the aforesaid clay reverse fired to make it sui'icienty strongand use it as a matrix to press the commercial records or I may pressinto the fired clay copy by care fully applied, gradually increasingpressure a thin steel or other suitable metaleplate, which Isubsequently manipulate in the usual or well known manner to form amatrix by which to press the commercial records.

lV hat I claim is l. The process which comprises originally recor 1ing asound groove .in Wax, and moldin@- a reverse therefrom in a plasticmaterial capa le of setting. Y

r. rhe process which comprises originally recording a sound groove in awax-like material, molding a reverse from said original in plasticmaterial capable of setting, and making from said reverse, after it hasset,

.a copy of the original in metal.

The process which comprises originally' recording a sound groove inwax-like material, molding a reverse therefrom in plastic heat resistivematerial capable ot' setting, castingl a copy of the original from saidreverse in metal, pantographing a copy from said metal copy', andforming a matrix from said pantcgrzphed copy.

vIn testimony whereof, .I have signed mv name to this speciiication,this 13th day ont ROBERT HEAD.

July, i915.

